Machine for rolling threads on metal



v 2sheets-Ps'heet 1 J. S.V WILSON @t J; H. HASKINS y I MAHINEFR ROLLING THREADS 0N METAL.'

(No Model.)

(No Model.) l 1 2 sheets-sheet 2.

J. lWILSON &*J. H. HASKINS.

MAGHINE'POR'ROLLING THREADSUN METAL.

No. 295,505. Paented M514. 25, 113684.

4UNITED. STATES. PATENT -FFICEo JOHN s.V wILsON AND JAMns anAfsKrNs, OF enIoAGO,ILLINOIS.

MACHINE FOR ROLLING THREADS ON METAL.

SPECIFICATION forming part of Letters Patent No, 295,605, dated March 25,

Application nica M115 29, rss2. (No mada.)

.To all whom t may concern,.-

Be it known that we, JOHN S. WrLsoNand JAMES H. HAsKINs, citizens of the United States, andresidents of Chicago, in the county of Cook, in the State of Illinois, have invented certain new and useful Improvements in Machines for Rolling Threads on Metal, which are i fully set forth in the following specication,

reference beinghad to the accompanying draw` ings, in which- Figure l represents a plan view of a machine embodying our improvement; Fig. `2, a vertical section of the same, taken on the line a a' in Fig. l; Fig. 3, a detail plan of the dies and die-holder; Fig. 4, a bottom plan section taken on the line y y in Fig. 2; Fig. 5, a detail plan of the timer; Fig. 6, a side elevation of the same; Fig. 7, a detail plan of the feedwheel; Fig. 8, a detail section of the same, on an enlarged scale,taken on the line z z, Fig. 7 5 Fig. 9, a detail plan of j a section of 'the feedwheel on the same enlarged scale; Fig. 10, a. detail elevation ofa portion of the outer or stationary die on a still more enlarged scale; Fig. 1l, a similar elevation of the inner or revolving die on the same scale as the last, and Fig. 12 awletail section taken on the line o o in Fig. 3 on the samescale as the last.

Our invention relates to a machine in which the threads are rolled on the metal instead of beingcut, as in the ordinary lathe-machine.

We will proceed to describe in detail a ma- A chine in which we have embodied our `invention in practical form, and will then point out definitely in the claims the improvements which We believe` to be new and wish to protect by Letters Patent. f

In the drawings, A represents a supportingframe of any suitable construction, on which is mounted a suitable bed-piece, A@ in the upper part of which is formed an inside rabbet, ,which serves ras a seat for one of thegthreaded dies. This die B is'of'annular form, and is attached ,to a similarly-shaped block, B, by means of` a tongue, b, on the die entering a corresponding groove, b', in the block, both arranged vertically, as shown in Fig. l2 of the drawings. The block anddie, fastened together, rest upon the seat in the bed-piece j ust mentioned, and plates C are fastened to the latter by means of screws @extending inward over the die and block, to hold them in place.

In the outer or rim portion of the bed-piece setting-screws C are arranged at suitable in-` tervals, which extend; inward through this rim `5 5 and .rest upon the outer face'of the die-block, so that the `latter may be adjusted or sprung inward by theaction of these screws. The inner or concave face of the dieis providedwith a series of threads, bl,`as shown in Fig. 100i' 6o N the drawings, and there are several sections of these threads on this face of the die.' `This `die and its block are held stationary `in the machine. Within the annular die isa cylindrical die, D,xed on a shaft, E. i Its dianieteris 6 5 smaller than the inner diameter of the annular i die, and its face is cut with a series of threads,

as hereinafter more fully explained.

On the lower endof the shaft E is a bevelgear, F, with which a^`corresponding pinion,

G, is arranged to engage, the latter being Xed to a horizontal driving-shaft, g, mounted on the lower part of the frame, and `provided with fast and loose. band-pulleys g g2, which are used in the ordinary way for driving, stopping, 7 5

radial armsh, projecting horizontally there,

from. Thesearms are attached to the-hub adjustably, so `that they may be adjusted in ara-` This timer, as shown in dial direction for the purpose of lengthening S 5 or shortening, .as may be desired. This may be eected by .a slot-and-pin connection, h, as shown in the drawings, Or by any other suitable device. i

`A feed wheel or disk, I, is monntedon a shaft, J, set in the bed-piece at one side thereof, the feed-wheel being arranged in the saine horizontal plane "as the timer. This feedwheel isprovided with a series of notches, i, cut `:into its Outer edge, and adapted to receive the blanks fed thereto by any suitable mechanism, the latter not being shown in the drawings as there are many well-known devices which are adapted to this purpose, `and may readily be applied by any one familiar Ico with this class of machines. The feed-wheel is of such size and so arranged that as it is revolved each notch will `bringa blank into proper position, with its lower end in front of 2 l Y. j 295,605

the entrance to the space between the two dies, when the notch holding the blank is brought round on the inner side of the wheel, as shown in Figs. 'l and 2 of the drawings. This wheel is provided with short arms or projections K, extending rradially from its outer edge. Itis desirable to have these projections adjustable circumferentially, for the purpose of taking up wear. attaching the projections to a separate piece,

. k, which is something like a shoe fitted to the rim of the feed-wheel. rlhe projections and shoe may be made in one piece, theformer being arranged at or near the rear ends of the latter, and at the forward ends are similar projections, 7c', though much shorter than the first named. The projections are provided with lugs or pins 7a2 at their inner ends, which enter a circumferential groove, i, in the wheel. A

slot, 7c, is cut inthe shoe lengthwise, and the latteris fastened to the wheel by means of a screw, lo, passed through the slot and entering threaded recesses @"2 in the wheel. Obviously, by loosening this screw, the shoe may be set back and forth on the circumference of the wheel for such adjustment as may be desired. The position of the shoe on the wheel is such that the shorter projections will bej ust back of the notches in the wheel.

The shaft J is set loosely in its bearing, being provided with a collar, j, which rests on the bed-piece, and at its lower end, underneath the latter, is surrounded by a spiral spring, j', which holds it down in place. To insure thepresentation of the blanksin proper position, a guide-arm, L, is attached to the bedpiece on the inside and below the feed-wheel, following the curve of the latter as it extends outward, as shown in'Fig. 3 of the drawings.

The blanks M are delivered into the notches of the feed-wheel so as to hang by their heads, as shown in the drawings, and the relation of the timer to the feed-wheel is such that each of its arms will strike one of the longer projections on the feed wheel as the two are brought together by the revolution of the cylindrical die, the arms of the timer being so arranged thereon and adj usted th at each one will move the feed-wheel forward just at the proper time and just the proper distance to enter the lower end of the blank between the dies at the moment the commencement of a series of threads on the revolving die is brought to correspond or register with the series of threads commencing at theend of the stationary die. The distance between the dies at the entrance where the blanks are delivered is about equal to the diameter of the blank, measuring from the edges of the threads. The

space between the two dies is, however, gradx ually constricted by springing in the station` ary die under the force of the set-screws, as already explained, the adjustment being such that at the end of the path the distance between the edges of the corresponding threads will be lessened to a sufficient degree to nisli the rolling of the thread on the blank to the XVe accomplish this byv the path finished.

exact depth desired. Obviously the constriction of the space between the dies will commence but a short distance from the opening, so that the threads will begin to bite the blank very soon after its entrance, when it immediately begins to turn under the, influence of the revolving die, and with this motion is carried along the path between the dies,the thread very gradually being rolled deeper and deeper, until nallyit is discharged at the other end of The feed-wheel,under the impulse of thetimer,is'broughtinto the position shown in Fig. l of the drawings, so as to just enter the blank between the dies,when the latter almost immediately begin to bite the blank, thereby turning it and carrying it inward, which movement carries the feed-wheel along until the blank is entered, releasing it from the notch when the feed-wheel is in proper position for the next arm of the timer to take the neXt operative projection on the feed-wheel. rlhe short projections back ofthe notches serve to retain the blanks in proper position and insure their delivery to the dies.

We have shown a machine fitted for threading ordinary short bolts. lf longer ones are to be operated upon, an additional wheel, N, may be mounted on the shaft J, provided with `ordinary notches, n, and arranged at such a distance above the regular feed-wheel as to receive the blank, and suspend it by its head in the prop er position for the operation ofthe dies.

The machine is adapted to work on blanks of different sizes by simply changing the dies, which, it will be seen by the description above, are readily removed and replaced. A corresponding adjustment of the timer and projections on-the feed-wheel must, however, be made to effect a proper delivery of the different-sized blanks to the dies, as will be readily understood. The construction shown in the drawings, and herein referred to, is adapted to roll the threads on half-inch bolts, in

which case the outer-die surface is composed of twelve sections, or blank circumference, and the inner die of ten similar sections, and the threads of the two dies differ in pitch, all as hereinafter more fully explained. It will be borne in mind that the threads upon the diefaces are reversely inclined, and that as the blank is rolled between them it is rolled by the inner die over the outer, thus measuring its circumference on the outer, while the inner moves upon and over it as the blank proceeds. Thus, when the blank has made one revolution from the starting-point, and is at the distance of its circumference from that point, theinner die has moved over the blank an equal distance. Further, the threads upon the dies are multiple threads, that repeat the impression upon the blank as it is moved forward. blank, in moving over the outer-die surface, commences at the starting-point of a thread, and receives there an impression. In order to have this impression repeated, another thread is started on the edge of the die-face at the distance from the starting-point of the first The IOO

equal to one circumference of the blank, and so on in succession. Thus the die-face is made up of sections marked by the starting-points of threads, and is in circumference a multiple of the blank circumference. The inclination of the die threads must conform to the required pitch of the screw to be made. As the blank makesia completerevolution on each section, each die-thread must be as many of these sections in length (i. e., must extend across as many sections) as the pitch of the screw requires. If, as in the example, the outer die includestwelve of these divisions, or twelve times the circumference of the blank, and we wish to form a screw with a pitch of onesixth of an inch, the blank must` pass over six divisions, or one-half of the whole die-cir cumference, and this would require a thread extending through six divisions of the dieface, with an inclination of one inch from the edge or margin of the die from which the thread started. If a pitch of one-twelfth of an inch were required, in like manner itwould appear that the die thread should extend through twelve divisions, or the whole die-circumference, with an inclination (or advance) of `one inch. The measure therefore of the length of die-face through which the die-thread will extendfor an inch length of blank is the quotient arising from the division of the number of threads to the inch by the number of divisions of thedie.- This thread obviously wrapped around the blank will go around it six times in one inch of length; but as the'inner die is smaller, with the same surface movement, as we have seen, upon the blank, it must have threads of a different pitch, for the same surface movement of the smaller die upon the blank gives a greater amount of revolution to Vthat die. Therefore the die-thread umust occupy a greater proportion of the die-surface, (i. e., have less pitch,) and that proportion must depend upon the variation between the diameters of the-two dies; but the distance inner die will be one inch less in diameter,

and will have ten divisions or blank circumferences. N Ve divide the number of threads to the inch by ten, (the number of sections,) and the quotient (six-tenths) will indicate the part of the inner-die circumference which the thread-will occupy, with an inclination of one inch, from the edge from which the thread started to form a screw with a pitch of six to the inch.

In the construction of dies for different-sited v `tapering upward, the opening in. the bed-4 piece within which the bushing is fitted being of corresponding shape.A This bushing 1s slit down on one side,. so that it maybe enlarged or contracted, as occasion may require,.and i the latter result is accomplished by providing a thread, o, at, the upper end, on which a` threaded collar, P, is turned, which is seated in the bed-piece just under the circular die. A collar, Q, is placed on the shaft below the bed-piece, which is also threaded, and engages with a similar thread, c, on the shaft, and 1s provided with a set-screw, q, by which it is fastened' in any place on the shaft to which 1t may be adjusted. The bushing is held between these two collars, and when adjustment is required by reason of wear the devices on the `upper end ofthe shaft are `removed and the upper collar turned down on the bushing, thereby drawing it upward and tightening the bearing. The lower collar may also be adjusted correspondingly. These devices, as well as some other parts of the machine, may be varied without changing the main characteristics of our improvement,

`which relates more particularly to the construction and operation of the dies bytmeans i of which the threads are rolled on the blanks. Ve do not intend to be understood, therefore, as limiting our invention to the specific machine above described in detail; but We are aware that `dies of the general form described-thatis to say,`.a`n inner cylindrical and an outer surrounding die threaded to form the screw--are not new, and we do not wish to be understood as claiming, broadly, this combination. e

Ve have not here shown and described mechanism for delivering the blanks to the feed-wheel. Any suitable mechanism adapted to this purpose may be employed, and the` mechanism for this purpose does not constitute a part of our present invention.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

1 In a machine for rolling threads upon metal, an annular non-revolvingthreaded dle, in combination with a cylindrical revolving die, reversely threaded, and of less pitch than the non-revolving die, as set forth.

2. In a machine for rolling threads upon metal, an annular non revolving threaded die, in combination with a cylindrical revolving die, reversely threaded, and of less pitch than the non-revolving die, the circumference of each die being a multiple of the blank circumference adapted to the space` between the die-surfaces.

3. The circular threaded die D, in combination with the curved threaded die B, pro- IOO IIO

vided with a tongue, b, the block B', provided with the groove b', and the set-screws c', substantially as and for the purpose set forth.

4. In a machine for rolling threads upon metal, a circular revolving die, in combination with a curved non-revolving die arranged outside the former, a feed-Wheel in which the blanks are held, and a timer arranged to revolve with the circular die and t0 act on the feed-Wheel to deliver the blanks to the opening of the space between Athe two dies at the proper moment, substantially as described.

5. The revolving die D, in combination n With the non-revolving` die B, the timer H, mounted on the shaft of the revolving die, and

,provided with arms h', and the feed-Wheel I,

provided with projections K, and mounted on loose shaft, so as to be turned by the timer, substantially 'as described.

6. The feed-wheel I, provided with a cirl substantially as and for the purposes set forth. 3o

JOHN S. WILSON. JAMES H. HASKINS.

fitnessesz FRANK B. OHAsE, A. A. Wrsn. 

